Caleffi Flow Switch, Universal, Series: 626, 5.7 gpm Flow Rate, 150 psi Pressure, -20 to 250 deg F, MNPT Connection, 250 V, NEMA 5/IP54 Enclosure, Brass, 3-7/16 in L x 1 in W x 5-5/16 in H Dimensions

The flow switch detects whether there is any flow in the piping and opens or closes an electrical contact. It is normally used in heating, air-conditioning, refrigeration, water treatment, additive pumping and process systems in general. The flow switch can control devices such as pumps, burners, compressors, refrigerators, motorized valves; to turn on indicator and alarm devices and regulate equipment for dosing water additives. In heating systems, the flow switch will switch the burner off in case of a lack of fluid circulation in heating circuit. A lack of fluid circulation would otherwise impair the operation of the temperature-sensitive safety and protection devices.